ios 从 UIPageViewController 隐藏点
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Hide dots from UIPageViewController
提问by Stefan Salatic
I would like to do to a pretty simple thing. Just remove all the dots, and the bar on the bottom of the UIPageViewController.
我想做一件很简单的事情。只需删除所有的点，以及 UIPageViewController 底部的栏。
This is the setup: I have a custom view controller which has UIPageViewController *pageController I display it like this:
这是设置：我有一个自定义视图控制器，它有 UIPageViewController *pageController 我像这样显示它：
self.pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageController.dataSource = self;
[[self.pageController view] setFrame:[self.view bounds]];
BSItemPageViewController *initialViewController = [self viewControllerAtIndex:selectedIndex];
NSArray *viewControllers = [NSArray arrayWithObject:initialViewController];
[self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self addChildViewController:self.pageController];
[[self view] addSubview:[self.pageController view]];
[self.pageController didMoveToParentViewController:self];
Any ideas on how do I remove the dots?
关于如何删除点的任何想法？
回答by jrturton
The page control is only displayed if the datasource implements these methods:
页面控件仅在数据源实现以下方法时才显示：
presentationCountForPageViewController:
presentationIndexForPageViewController:
Simply remove your implementation of these, and the page control will not be displayed. From the datasource docs:
只需删除您对这些的实现，页面控件将不会显示。从数据源文档：
If both of the methods in “Supporting a Page Indicator” are implemented and the page view controller's transition style is UIPageViewControllerTransitionStyleScroll, a page indicator is visible.
如果“支持页面指示器”中的两个方法都实现，并且页面视图控制器的过渡样式为 UIPageViewControllerTransitionStyleScroll，则页面指示器可见。
回答by mts
In my situation I have multiple UIPageViewControllers (created from -[UITableView didSelectRowAtIndexPath]), some of which contain only 1 page. Instead of using different controllers for different UITableView rows, I implemented the UIPageViewController delegate method as follows:
在我的情况下，我有多个 UIPageViewControllers（从 -[UITableView didSelectRowAtIndexPath] 创建），其中一些只包含 1 页。我没有为不同的 UITableView 行使用不同的控制器，而是实现了 UIPageViewController 委托方法，如下所示：
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
return ([self numberOfPages] == 1 ? 0 : [self numberOfPages]);
}
This returns 0 if there is only 1 page which seems to make UIPageViewController not show the dots. It's a kludge but it appears to work (iOS SDK 7.0).
如果只有 1 个页面似乎使 UIPageViewController 不显示点，则返回 0。这是一个混乱，但它似乎工作（iOS SDK 7.0）。
I suppose a "cleaner" way would be to remove the methods at runtime for those UIPageControllers having only 1 page, but this would involve some fancy objC runtime manipulation.
我想一个“更干净”的方法是在运行时删除那些只有 1 个页面的 UIPageController 的方法，但这将涉及一些花哨的 objC 运行时操作。
Comments on this approach?
对此方法有何评论？
回答by iOSergey
If you want to hide those dots dynamically at runtime, then return -1 from the presentationIndexForPageViewController delegate:
如果你想在运行时动态隐藏这些点，那么从presentationIndexForPageViewController委托中返回-1：
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return yourPageVCs.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return yourPageVCs.count > 1 ? 0 : -1
}
In this case if you have only 1 (single sided) page, dots will be hidden.
在这种情况下，如果您只有 1 个（单面）页面，点将被隐藏。
回答by muhammed basil
The above fixes works fine with fixed number of pages at the beginning.
上述修复在开始时使用固定数量的页面可以正常工作。
I tried different approaches to solve the problem when pages can be increased or decreased dynamically.
当页面可以动态增加或减少时，我尝试了不同的方法来解决这个问题。
So I used below method which will manually hide the component itself.
所以我使用了下面的方法，它将手动隐藏组件本身。
func togglePageControl(pageCount: Int, threshold: Int = 1) {
var hidden = true
if pageCount > threshold {
hidden = false
}
for subView in self.view.subviews {
if subView is UIScrollView {
subView.frame = self.view.bounds
} else if subView is UIPageControl {
subView.isHidden = hidden
}
}
}
And this should be called from
这应该从
public func presentationCount(for pageViewController: UIPageViewController) -> Int {
togglePageControl(pageCount: pages.count)
// or togglePageControl(pageCount: pages.count, threshold: 5)
return pages.count
}
回答by Daniel
As Lee pointed out, simply not implementing the methods presentationCountForPageViewControllerand presentationCountForPageViewControllersuffers from an accessibility issue during voiceover where it won't read out the page number (1 of 5, 2 of 5, etc.). A solution that will support accessibility is:
正如 Lee 指出的那样，简单地不实现presentationCountForPageViewController和presentationCountForPageViewController方法会在画外音期间遇到可访问性问题，它不会读出页码（1 of 5、2 of 5 等）。支持可访问性的解决方案是：
// Swift
let proxy = UIPageControl.appearance()
proxy.isHidden = true
// Objective-C
UIPageControl *proxy = [UIPageControl appearance];
[proxy setHidden:YES];
This has the added benefit of maintaining a cleaner separation between the data source and its presentation.
这有一个额外的好处，即在数据源和它的表示之间保持更清晰的分离。
UPDATE: This is unfortunately not a perfect solution since it hides the control but doesn't remove it (there remains an empty space the same height of the hidden control). I haven't yet been able to find a way to configure the existing control to fix this issue.
更新：不幸的是，这不是一个完美的解决方案，因为它隐藏了控件但没有删除它（仍然有一个与隐藏控件高度相同的空白空间）。我还没有找到一种方法来配置现有控件来解决这个问题。
